CY7C028-20AC Cypress Semiconductor Corp, CY7C028-20AC Datasheet - Page 10

• Manufacturer Part Number: CY7C028-20AC
• Description: IC SRAM 1MBIT 20NS 100LQFP
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C028-20AC

• Format - Memory: RAM
• Memory Type: SRAM - Dual Port, Asynchronous
• Memory Size: 1M (64K x 16)
• Speed: 20ns
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 100-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 428-1444

Switching Waveforms
Document #: 38-06042 Rev. *A
Write Cycle No. 2: CE Controlled Timing
Write Cycle No. 1: R/W Controlled Timing
Notes:
28. R/W must be HIGH during all address transitions.
29. A write occurs during the overlap (t
30. t
31. If OE is LOW during a R/W controlled write cycle, the write pulse width must be the larger of t
32. To access RAM, CE = V
33. To access upper byte, CE = V
34. Transition is measured 500 mV from steady state with a 5-pF load (including scope and jig). This parameter is sampled and not 100% tested.
35. During this period, the I/O pins are in the output state, and input signals must not be applied.
36. If the CE or SEM LOW transition occurs simultaneously with or after the R/W LOW transition, the outputs remain in the high-impedance state.
CE
DATA OUT
ADDRESS
ADDRESS
CE
DATA IN
DATA IN
[32,33]
the bus for the required t
To access lower byte, CE = V
HA
[32,33]
R/W
R/W
is measured from the earlier of CE or R/W or (SEM or R/W) going HIGH at the end of write cycle.
OE
SD
IL
. If OE is HIGH during an R/W controlled write cycle, this requirement does not apply and the write pulse can be as short as the specified t
, SEM = V
IL
, LB = V
IL
(continued)
t
t
, UB = V
SA
SA
NOTE 35
IH
SCE
IL
.
, SEM = V
IL
or t
, SEM = V
PWE
) of a LOW CE or SEM and a LOW UB or LB.
IH
.
t
[28, 29, 30, 34, 35]
IH
HZWE
[28, 29, 30, 31]
.
[34]
t
t
AW
AW
t
t
WC
WC
t
t
SCE
PWE
[31]
t
t
PWE
SD
SD
or (t
HZWE
+ t
SD
t
t
HA
HA
) to allow the I/O drivers to turn off and data to be placed on
t
t
HD
HD
t
LZWE
t
HZOE
CY7C027/028
CY7C037/038
[34]
NOTE 35
Page 10 of 19
PWE
.